author | aefimov |
Fri, 10 Apr 2015 14:54:20 +0300 | |
changeset 29839 | 6d5d546e953b |
child 31109 | a542f8dcbbf8 |
permissions | -rw-r--r-- |
29839
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/* |
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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package javax.xml.bind; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.IOException; |
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import java.lang.reflect.Method; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.Iterator; |
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import java.util.Properties; |
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import java.util.ServiceLoader; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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|
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/** |
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* Shared ServiceLoader/FactoryFinder Utils shared among SAAJ, JAXB and JAXWS |
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* - this class must be duplicated to all those projects, but it's |
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* basically generic code and we want to have it everywhere same. |
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* |
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* @author Miroslav.Kos@oracle.com |
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*/ |
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class ServiceLoaderUtil { |
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private static final String OSGI_SERVICE_LOADER_CLASS_NAME = "com.sun.org.glassfish.hk2.osgiresourcelocator.ServiceLoader"; |
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private static final String OSGI_SERVICE_LOADER_METHOD_NAME = "lookupProviderClasses"; |
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static <P> P firstByServiceLoader(Class<P> spiClass, Logger logger) { |
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// service discovery |
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ServiceLoader<P> serviceLoader = ServiceLoader.load(spiClass); |
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for (P impl : serviceLoader) { |
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logger.fine("ServiceProvider loading Facility used; returning object [" + impl.getClass().getName() + "]"); |
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return impl; |
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} |
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return null; |
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} |
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static boolean isOsgi(Logger logger) { |
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try { |
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Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME); |
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return true; |
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} catch (ClassNotFoundException ignored) { |
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logger.log(Level.FINE, "OSGi classes not found, OSGi not available.", ignored); |
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} |
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return false; |
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} |
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static Object lookupUsingOSGiServiceLoader(String factoryId, Logger logger) { |
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try { |
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// Use reflection to avoid having any dependendcy on ServiceLoader class |
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Class serviceClass = Class.forName(factoryId); |
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Class target = Class.forName(OSGI_SERVICE_LOADER_CLASS_NAME); |
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Method m = target.getMethod(OSGI_SERVICE_LOADER_METHOD_NAME, Class.class); |
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Iterator iter = ((Iterable) m.invoke(null, serviceClass)).iterator(); |
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if (iter.hasNext()) { |
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Object next = iter.next(); |
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logger.fine("Found implementation using OSGi facility; returning object [" + next.getClass().getName() + "]."); |
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return next; |
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} else { |
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return null; |
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} |
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} catch (Exception ignored) { |
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logger.log(Level.FINE, "Unable to find from OSGi: [" + factoryId + "]", ignored); |
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return null; |
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} |
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} |
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|
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static String propertyFileLookup(final String configFullPath, final String factoryId) throws IOException { |
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File f = new File(configFullPath); |
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String factoryClassName = null; |
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if (f.exists()) { |
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Properties props = new Properties(); |
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FileInputStream stream = null; |
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try { |
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stream = new FileInputStream(f); |
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props.load(stream); |
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factoryClassName = props.getProperty(factoryId); |
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} finally { |
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if (stream != null) { |
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try { |
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stream.close(); |
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} catch (IOException ignored) { |
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} |
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} |
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} |
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} |
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return factoryClassName; |
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} |
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static void checkPackageAccess(String className) { |
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// make sure that the current thread has an access to the package of the given name. |
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SecurityManager s = System.getSecurityManager(); |
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if (s != null) { |
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int i = className.lastIndexOf('.'); |
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if (i != -1) { |
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s.checkPackageAccess(className.substring(0, i)); |
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} |
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} |
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} |
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|
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static Class nullSafeLoadClass(String className, ClassLoader classLoader) throws ClassNotFoundException { |
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if (classLoader == null) { |
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return Class.forName(className); |
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} else { |
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return classLoader.loadClass(className); |
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} |
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} |
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/** |
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* Returns instance of required class. It checks package access (security) unless it is defaultClassname. It means if you |
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* are trying to instantiate default implementation (fallback), pass the class name to both first and second parameter. |
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* |
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* @param className class to be instantiated |
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* @param isDefaultClassname says whether default implementation class |
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* @param handler exception handler - necessary for wrapping exceptions and logging |
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* @param <T> Type of exception being thrown (necessary to distinguish between Runtime and checked exceptions) |
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* @return instantiated object or throws Runtime/checked exception, depending on ExceptionHandler's type |
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* @throws T |
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*/ |
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static <T extends Exception> Object newInstance(String className, String defaultImplClassName, final ExceptionHandler<T> handler) throws T { |
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try { |
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return safeLoadClass(className, defaultImplClassName, contextClassLoader(handler)).newInstance(); |
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} catch (ClassNotFoundException x) { |
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throw handler.createException(x, "Provider " + className + " not found"); |
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} catch (Exception x) { |
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throw handler.createException(x, "Provider " + className + " could not be instantiated: " + x); |
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} |
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} |
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|
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static Class safeLoadClass(String className, String defaultImplClassName, ClassLoader classLoader) throws ClassNotFoundException { |
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try { |
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checkPackageAccess(className); |
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} catch (SecurityException se) { |
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// anyone can access the platform default factory class without permission |
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if (defaultImplClassName != null && defaultImplClassName.equals(className)) { |
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return Class.forName(className); |
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} |
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// not platform default implementation ... |
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throw se; |
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} |
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return nullSafeLoadClass(className, classLoader); |
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} |
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|
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static String getJavaHomeLibConfigPath(String filename) { |
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String javah = AccessController.doPrivileged(new PrivilegedAction<String>() { |
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@Override |
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public String run() { |
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return System.getProperty("java.home"); |
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} |
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}); |
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return javah + File.separator + "lib" + File.separator + filename; |
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} |
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|
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static ClassLoader contextClassLoader(ExceptionHandler exceptionHandler) throws Exception { |
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try { |
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return Thread.currentThread().getContextClassLoader(); |
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} catch (Exception x) { |
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throw exceptionHandler.createException(x, x.toString()); |
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} |
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} |
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|
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static abstract class ExceptionHandler<T extends Exception> { |
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|
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public abstract T createException(Throwable throwable, String message); |
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|
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} |
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} |